One of the ways to be more productive per call is to prepare for each call like you do for a meeting. Here’s an article from Selling Power about it.

The more thoroughly you prepare for a meeting of any kind, even with just one other person, the more effective you will appear and the better results you will get…. When I walk out of the meeting, what goals do I want to have accomplished? Write them down. The greater clarity you have regarding the desired outcome of your meeting, the easier it will be to prepare for that meeting, and the more likely it is you will achieve your goals, says Brian Tracy. …. Think like a lawyer…..Know their fears.